Everything is fine and look beautiful, except for Chromium browser.
I have the feeling that Chromium do not take into account lcdfilter settings.

Unfortunately, that is correct._________________If ~amd64 ebuilds are cutting edge, then git-9999 ebuilds are chainsaws.
"Not everyone can ride a unicycle, does that mean we should put another wheel on it?" - Lokheed

The following USE changes are necessary to proceed:
#required by x11-libs/cairo-1.10.2-r2[X], required by cairo (argument)
>=x11-libs/libXft-2.3.0-r1 cleartype
#required by x11-libs/cairo-1.10.2-r2, required by cairo (argument)
>=media-libs/fontconfig-2.8.0-r2 cleartype

That was very silly of me. I had cairo +cleartype in a separate file in /etc/portage/package.use._________________emerge --quiet redefined | E17 vids: I, II | Now using e17 | e18, e19, and kde4 sucks :-/

My fonts look much better thanks to the contributed patches. One question: by default the variables below are exported globally. I don't suppose they have analogous counterparts that can be set in a fontconfig XML file, or somewhere besides the environment? I only glanced at the original (infinality) patch, but I'm guessing the only alternative is to define them at compile time.

My fonts look much better thanks to the contributed patches. One question: by default the variables below are exported globally. I don't suppose they have analogous counterparts that can be set in a fontconfig XML file, or somewhere besides the environment? I only glanced at the original (infinality) patch, but I'm guessing the only alternative is to define them at compile time.

Bi3l doesn't change the patches, he fits them to gentoo. (/etc/env.d/99lcdfilter and /usr/lib/ft-settings.sh)

Use horizontal RGB sub-pixel anti-aliasing for LCD flat panels.
Use vertical hinting only and completely discard the horizontal one.
Use accurate glyph advance values, calculated at a high resolution for unhinted glyphs.
Use accurate, high resolution values from the kerning table.

2. Why isn't it upstream already?
3. Why isn't there a guide in first post?
4. Most of all: what does it do? Don't redirect me to reading 100 of pages of configuration XML, thank you.